Bon beseabch labobatobies



Reissued Apr. 1, 1930 PATENT OFFICE ARTHUR R. LYTLE, OF FLUSHING, NEW YORK, ASSIGNOR TO UNION CARBIDE & CAR- BON RESEARCH LABORATORIES, INC., CORPORATION OF NEW YORK NONFERROUS WELDING non Ho Drawing. Original No. 1,716,590, dated June 11, 1929, Serial No. 236,230,

filed December 6, 1927.

Application for reissue filed February 19, 1930. Serial No. 429,812.

My invention relates to brass welding rods that may be utilized extensivelyfor fusion welding or brazin brass and bronze alloys and for bronze we ding copper and ferrous 6 alloys.

Brass welding rods consisting principally of an alloy of copper and zinc, but known commercially as bronze welding rods, are used extensively for uniting steel, cast iron,

10 malleable iron, copper and brass sections.

The principal merits of these rods are low melting point, the ease with which a good union with the base metal is obtained, and the ductility of the. weld-produced. However, their use has been limited because of the lack in the deposited metal of wearing qualities and strength as compared to steel, and because in welding, they emit clouds of fumes that are troublesome to the operator.

Attempts have been made to increase the strength of these alloys by adding tin, manganese and iron, but excessive amounts of tin makes the alloy brittle, and manganese and iron, more particularly the former, adverse- 25 ly effect the welding properties and make the weld metal porous. Iron up to 1.1% has been added to provide a welded bearing metal but the deposited metal is quite porous and is unsuitable for joining members where strength and ductility are required.

My welding rods contain copper and zinc in the approximate proportion of 60 parts of copper to 40 parts of Zinc. The rods contain from .01% to 4% silicon. For obtaining weld metal of greater strength, I modify the rods by the addition of iron or manganese, or both iron and manganese. The content of iron and manganese may vary from O to 4%. When manganese is present the silicon content is preferably, though not necessarily, at least 10% of the manganese content. In general, an increase in strength accompanies an increase in the content of iron and manganese, provided silicon is present. The presence of a small amount of tin increases the fluidity of the melted metal and is a desirable constituent. One-tenth per cent of tin is beneficial but I may in some cases include as much I have made rods containing Copper -65 Silicon .01- 4 Manganese 0- 4 Iron 0- 4 T n 0 1.5% Zinc Balance,

the proportion of copper to zinc being with- 111 the range 2:1 to 4:3.

bond to form between the base metal and weld metal, the strength and wearing qualities of the latter being considerably greater than wheln the old type of bronze welding rods is user.

The following alloys are illustrative of my invention I A B I o I D I E J F I l 0ppper.. 57.00 59.00 59. 40 58.80 I 60. 00 61.00 Z1nc 41.96 33.74: 38.671 37.86! 37.15- 37.90 Iron. 1.00 1.00 1.00 l 1. 40 1.00 I .70 Manganese. .03 1.25 .85 i 1. 80 1.00 .28 81110011.. .01 .01 .08 1 .14 I .20 1 .07 Tin W i .05

For most welding purposes I prefer rods contaming copper 58% to 60%, iron .75% to 1.25%, manganese .85% to 1.1%, tin nil to 0.20%, silicon 10% to 25% and the remain-' der zinc and minor impurities.

I claim:

1. A welding rod consisting predominately of copper and zinc and containing silicon .1% to 25%, iron .75% to 1.5% and manganese .85 to 2%, the copper being about 58% to 60%.

2. A welding rod consisting predominately of copper and zinc and containing silicon .1% to 25%, iron .75% to 1.25% and manganese .85% to 1.1%, the copper being about 58% to 60%.

3. A welding rod containing copper, zinc and silicon; the sum of the copper and zinc 5 contents being at least 82.5% t e copper content falling within the range 55% to 65% and the silicon content falling between 0.01% and 4%.

4. A welding rod containing copper, zinc, silicon and tin; the sum of the copper and zinc contents being at least 82.5%; the copper content falling within the range 55% to 65%; the silicon content falling between 0.01% and 4%; and the tin content falling between 0.1% and 1.5%.

5. A welding rod containing copper; zinc, silicon, tin an a strengthening addition of a metal having the properties of iron and. manganese; the sum of the co per and zinc contents being at least 82.5%; t e copper content falling within the range to the silicon content falling between 0.01% and 4%; the tin content falling between 0.1% and 1.5%; and the content of strengthening 25 metal being not greater than 4%.

In testimony whereof, I afiix my signature.

ARTHUR R. LYTLE. 

